This study crafted a laboratory manual in General Chemistry education for Senior High School to help teachers and learners make learning experiential in nature. The laboratory manual was anchored on the Analysis, Design, Development, Implementation, and Evaluation (ADDIE) Model. The Analysis part allows learners to design activities which they develop, implement and evaluate in the course of their laboratory work. The learning tasks in the laboratory manual were responsive to the learning competencies of the General Chemistry 1 Curriculum Guide of the K-12 Program. Fifteen laboratory competencies in General Chemistry 1 were covered and a total of sixteen laboratory activities were formulated. The descriptive method of research through the process of instrumentation was utilized on the development of the ADDIE-based laboratory manual. The validation results by “experts” on the developed General Chemistry 1 Laboratory Manual show high reliability. The try-outs of the validated laboratory manual were conducted among students in the STEM (Science, Technology, Engineering, and Mathematics) academic track and revealed significant change of the pre-test scores compared with their post-test scores after exposure to the ADDIE-based laboratory manual. It indicated an improvement on the learning of the students. Classroom observations during the try-outs were conducted and showed that the ADDIE-based laboratory manual aided the teacher in attaining the criteria indicated in assessing teacher performance in terms of teaching effectiveness indicators. Hence, the ADDIE-based laboratory manual may be recommended for use in the teaching of General Chemistry 1 for Senior High School students.
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